HP VPN Firewall Appliances Network Management Configuration Guide

• External loopback testing—Tests hardware of Ethernet interfaces. To perform external loopback

testing on an Ethernet interface, connect a loopback plug to the Ethernet interface. The device sends

test packets out of the interface, which are expected to loop over the plug and back to the interface.

If the interface fails to receive any test packets, the hardware of the interface is faulty.

Configuration restrictions and guidelines

• On an interface that is physically down, you can only perform internal loopback testing. On an

interface administratively shut down, you cannot perform internal or external loopback testing.

• The speed, duplex, mdi, and shutdown commands are not available during loopback testing.

• During loopback testing, the Ethernet interface operates in full duplex mode. When you disable

loopback testing, the port returns to its duplex setting.

• When a Layer 3 Ethernet interface operates in bridge mode (as a Layer 2 Ethernet interface) or in

promiscuous mode, the interface does not support loopback testing.

Configuration procedure

To enable loopback testing on an Ethernet interface:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter Ethernet interface view.

interface interface-type

interface-number

N/A

3. Enable loopback testing.

loopback { external | internal }

By default, loopback testing is

disabled.

Configuring the link mode of an Ethernet interface

Depending on the hardware structure of interface cards, for a device, some interfaces can operate only

as Layer 2 Ethernet interfaces (in bridge mode), some can operate only as Layer 3 Ethernet interfaces (in

route mode), but others can operate either as Layer 2 or Layer 3 Ethernet interfaces (you can set the link

mode to bridge or route).

You can configure the link mode in system view or in Ethernet interface view, which produces the same

result. The link mode configuration in system view applies to multiple interfaces, and the link mode

configuration in interface view applies only to the current interface.

Configuration restrictions and guidelines

• After you change the link mode of an Ethernet interface, all settings of the Ethernet interface are

restored to their defaults under the new link mode.

• The link mode configuration for an Ethernet interface in system view and in interface view

supersedes each other.

Configuration procedure

To change the link mode of the specified Ethernet interfaces in system view:

Ste

Command

1. Enter system view.

system-view